Spring seat cushion



Aug. 25, 1953 ML sTuBNlTz SPRING SEAT CUSHION Filed Dec. 19, 1949 11s/VENTO@ Maur/ce Stubn/j Patented Aug. 25, 1953 SPRING SEAT CUSHION Maurice Stubnitz, Adrian, Mich., assignor to Stubnitz-Greene Spring Corporation, Adrian, Mich., a corporation of Michigan Application December 19, 1949, Serial No. 133,724

3 Claims.

This invention relates to cushion seats for trucks and similar vehicles. It is the object of the invention not only to provide a truck seat at minimum cost, but also to provide a truck seat which will afford maximum comfort for the rider. The invention uses a base frame of double J cross section in which the upper J bends over the turned up ends of the cross members and anchors these to the frame while the gullet of the lower J Iseats the turned over ends of the jack springs. These ends are anchored to the J frame by means of a turned out portion of the metal of the J frame.

Referring to the drawings:

Fig. 1 is a cross section of the invention showing the base frame formed by double J bars.

Fig. 2 is a detail of the double J bar showing how the turned over end of the jack spring is anchored in place by a turned over piece of the Ametal of the J bar.

Fig. 3 is a detail showing how the coil springs are anchored to the lattice like mat.

Fig. 4 is a cross section `of the J frame showing how the member is pinched over and welded to the turned up cross strap end.

The spring is made up of a plurality of short conical springs I4 which are connected together at their top by means of a wire border frame I5. These springs are supported at the lower ends by means of a wire mat formed by the stringers I8 and I9 which cross each other and are interlaced into the bottom coil of the conical coil load supporting springs I4. These springs can be assembled in the mat by screwing them into the intersecting wires I8 and I9 as shown in Fig. 3. The stringers I3 are yieldable stringers supported at the front and rear by jack or safety pin type springs forming spring legs which are a continuation of the stringers I8. This construction is more thoroughly described and claimed in my prior application Serial No. 45,175, filed August 19, 1948, now Patent No. 2,642,929.

The base frame of the spring assembly is formed by channel strips 26 which are double J strips, that is, the upper edges are turned over to form the J portion 21 and the lower edges are turned over to form the lower J portion. The upper J portion 21 is adapted to be turned down to engage over the turned up ends 28 of the cross bars 29 as shown in Fig. 4. The ends `of the safety pin type springs Vare turned over at I I a and the clip portions 3l are struck out of the metal of the double J strips and wrapped around the bent over ends Ila to hold these in place and secure the jack springs to the base strip so that the legs of the jack springs can pivot when the seat spring is put under load.

What I claim is:

l. A seat cushion having a base frame, a spring assembly secured to the base frame, the said spring assembly comprising a plurality of coiled load supporting springs, a latticed spring mat made up of spring wire stringers crossing one another and locked into the bottom whorls of the load supporting springs, the front and rearwardly extending stringers ending in safety pin or jack springs having turned over ends which are secured to the base frame, the base frame including iront and rear J strip rails, each having a double J cross-section, connected by cross straps having turned up ends over which one J portion of the strip is pinched and the turned over ends of the jack springs anchored in the gullet of the frame, between the two J portions.

2. A seat cushion having a base frame, a spring assembly secured to the base frame, the said spring assembly comprising a plurality of coiled load supporting springs, a latticed spring mat made up of spring wire stringers crossing one another and locked into the bottom whorls of the load supporting springs, the front and rearwardly extending stringers ending in safety pin or jack springs having turned over ends which are secured to the base frame, the base frame including front and rear J strip rails, each having a double J cross-section, connected by cross straps having turned up ends over which one J portion of the strip is pinched and the turned over ends of the jack springs anchored in the gullet of the frame, between the two J portions, the metal of the frame bar being struck out and rolled over such turned over ends of the jack springs.

3. A. seat cushion having a base frame, a spring assembly secured to the base frame, the said spring assembly comprising a plurality of coiled load supporting springs, a latticed spring mat made up of spring wire stringers crossing one another and locked into the bottom whorls of the load supporting springs, the front and rearwardly extending stringers ending in safety pin or jack springs having turned over ends which are secured to the base frame, the base frame including front and rear J strip rails, each having a double J cross-section, connected by cross straps having turned up ends over which one J portion of the strip is pinched and the turned over ends of the jack springs anchored in the gullet of the frame, between the two J portions, the said frame pinched over the turned References Cited in the le of this patent UNITED STATES PATENTS Name Date Bachmann Jan. 11, 1910 Number K 946,125

Number 4 Name Date Travis Jan. 28, 1913 Stubnitz Feb. 25, 1936 Stubnitz May 17, 1938 Caughey July 26, 1938 Pleet, Feb. 28, 1939 Lind May 28, 1940 Robinson. Oct. 28, 1941 Overby etvalf. Mar. 2, 1948 

